LineageOS is a free and open-source operating system for mobile devices, based on Android. It's a continuation of the CyanogenMod project and offers a customizable, secure alternative Android experience without bloatware.
Check 22,000+ devices with open firmware or open protocols (OpenWrt, LineageOS, coreboot, Zigbee2MQTT, Tasmota…) before reverse engineering one; claim a device while you work on it and publish your findings when done.
